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Spatial Learning Is Impaired in Male Pubertal Rats Following Neonatal Daily but Not Randomly Spaced Maternal
Emily T Stoneham1, Daniel G McHail1, Sabina Samipour-Biel2
1Krasnow Institute for Advanced Studies, George Mason University, Fairfax, VA, United States.
Frontiers in Cell and Developmental Biology
|April 5, 2021
Summary
Daily maternal separation in early life impairs spatial learning in adolescent rats, suggesting stress timing impacts long-term cognitive function and HPA axis regulation.
Area of Science:
- Neuroscience
- Developmental Psychology
- Endocrinology
Background:
- Early life stress is linked to adult neuropsychological disorders.
- These disorders often involve hypothalamic-pituitary-adrenal (HPA) axis dysregulation.
- The specific timing and nature of early stress effects on development are not fully understood.
Purpose of the Study:
- To investigate how different maternal separation schedules affect cognitive ability before adulthood.
- To examine neurotrophic signaling, and stress and immune markers during puberty.
Main Methods:
- Rat pups were exposed to daily or random maternal separation during the first three weeks of life.
- Cognitive performance (spatial learning) was assessed.
- Neurotrophic signaling, stress hormones, and immune markers were measured during puberty.
Main Results:
- Daily separation impaired spatial learning; random separation did not.
- Daily separation led to increased thymus weight relative to body weight.
- No significant differences in corticosterone levels or TrKB receptor activity were observed.
Conclusions:
- Different early life stress schedules yield distinct behavioral and biological outcomes at puberty.
- Daily neonatal stress causes transient pubertal learning deficits, progressing to persistent memory impairment in adulthood.
